Six months after the highly anticipated launch of its virtual-reality goggles, Facebook Inc.’s Oculus unit is facing a reality check.

Oculus, reuniting its developers this week for the first time since the launch of the Rift goggles, is coping with competition from HTC Corp. and Sony Corp., and a string of disappointing gaffes. Shipping problems and a higher-than-expected price bungled the launch. The headset still doesn’t have a hit game that would broaden its appeal to mainstream consumers.